An autotroph gets its energy by direct sunlight.An autotroph makes its own food during photosynthesis.An autotroph is organism that makes its own food.An autotroph is like a plant because they both make their own food.Some bacteria are autotroph. Coolidge-Stoltz, Elizabeth. Focus on California Life Science. Boston, MA: Pearson Prentice Hall, 2008. Print.

Organisms are divided into autotrophs and heterotrophs according to their energy pathways. Autotrophs are those organisms that are able to make energy-containing organic molecules from inorganic raw material by using basic energy sources such as sunlight. Plants are the prime example of autotrophs, using photosynthesis. All other organisms must make use of food that comes from other organisms in the form of fats, carbohydrates and proteins. These organisms which feed on others are called heterotrophs. Autotrophs and Heterotrophs." Web. 30 Nov. 2011. <http://hyperphysics.phy-astr.gsu.edu/hbase/biology/autotroph.html>.

Autotrophs obtain energy through a process called photosynthesis, in which the chloroplasts in the cells capture sunlight and transform that into glucose for energy they can use, and emit oxygen into the air.The reactants are carbon dioxide and water. "How Do Autotrophs Differ from Heterotrophs in Obtaining Energy." The Q&A Wiki. Web. 30 Nov. 2011. <http://wiki.answers.com/Q/How_do_autotrophs_differ_from_heterotrophs_in_obtaining_energy>.